fn get_own_username<U: PwdGrpProvider>(userdb: &U) -> Result<Option<Vec<u8>>>Available on
target_family="unix" and non-iOS and non-Android and non-tvOS only.Expand description
Find our username, if possible.
By default, we look for the USER environment variable, and see whether we an find a user db entry for that username with a UID that matches our own.
Failing that, we look for a user entry for our current UID.